Abstract: Objective To measure noise made by prosthodontists on workdays and in normal operations, and analyze noise exposure of prosthodontists. Methods ①The noise of clinic on workday was measured from 9am-10am at the same location. ②In the case of only one operation working, the noise of normal operation was measured at 15 cm, 30 cm, 45 cm. Results ①Environment noise of prosthodontic clinic was 63.6-73.5 dB. ②In the case of only one operation working, noise declined when measuring distance increased. The difference between the groups was statistically significant. The intensity of noise did not harm the hearing system. Conclusion Although the intensity of noise did not harm prosthodontists' hearing system, the frequency of noise ,the harm to nervous and cardiovascular systems should be focused .It benefits noise protection when prosthodontists keep standard gesture .

Key words: prosthodontist, equipment noise, environment noise, hearing impairment